<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Strict//EN' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <link rel="stylesheet" type="text/css" href="style.css" />
    <title>Cygwin Licensing Terms</title>
  </head>

<body>
<!--#include virtual="navbar.html" -->
<div id="main">
<!--#include virtual="top.html" -->
<h1>What are the licensing terms?</h1>

<p>
Most of the tools are covered by the GNU GPL, some are public domain,
and others have a X11 style license.  To cover the GNU GPL
requirements, the basic rule is if you give out any binaries, you must
also make the source available.  For the full details, be sure to read
the text of the <a href="COPYING">GNU General Public License (GPL)</a>.
</p>

<p>
The Cygwin&trade; API library found in the winsup subdirectory of the
source code is covered by the GNU Lesser General Public License (LGPL)
version 3 or later. For details of the requirements of LGPLv3, please
read the <a href="COPYING.LIB">GNU Lesser General Public License (LGPL)</a>.
</p>

<p>
For more information on the GPL see the
<a href="https://gnu.org/licenses/gpl-faq.html">GPL FAQ</a>.
</p>

<div class="background">
<b class="rtop"><b class="r1"></b><b class="r2"></b><b class="r3"></b><b
class="r4"></b></b>
<h2>Cygwin&trade; Linking Exception</h2>
<b class="rbottom"><b class="r4"></b><b class="r3"></b><b class="r2"></b><b
class="r1"></b></b>
</div>

<tt>
<p>As a special exception, the copyright holders of the Cygwin library
grant you additional permission to link libcygwin.a, crt0.o, and
gcrt0.o with independent modules to produce an executable, and to
convey the resulting executable under terms of your choice, without
any need to comply with the conditions of LGPLv3 section 4. An
independent module is a module which is not itself based on the
Cygwin library.</p>
</tt>

<div class="background">
<b class="rtop"><b class="r1"></b><b class="r2"></b><b class="r3"></b><b class="r4"></b></b>
<h2>Does Cygwin&trade; have an ECCN number?</h2>
<b class="rbottom"><b class="r4"></b><b class="r3"></b><b class="r2"></b><b class="r1"></b></b>
</div>

<tt>
<p>No.  Cygwin source and binary are made publicly available and free of
charge to download so Cygwin is provided under TSU/TSPA exemption. As a result,
Cygwin does not require an ECCN number.</p>
</tt>

</div>
</body>
</html>
